The screenshots above highlights an area that is claimed by Venezuela, see: https://simple.wikipedia.org/wiki/Guayana_Esequiba
I recommend you to take into account this document to label the new cartography.
With respect to French Guiana, @Mattflaschen-WMF is correct about why the name isn't displayed. French Guiana (https://www.openstreetmap.org/node/313753808) is considered in OSM to be a "state" as it's an overseas department of France, and "state" names aren't displayed at all in osm-bright, the current Wikimedia map style. (Similarly, for example, U.S. state and Canadian province names are also not displayed on https://maps.wikimedia.org at any zoom level).
I still need to figure out what's going on with Guyana.
This issue doesn't appear to be unique to our tile server. This unrelated tile server showcasing osm-bright also never displays Guyana's name: